Synonyms for Debonair (same or very similar meaning)
WordNet sense 1 (having a sophisticated charm):
suave, debonaire, debonnaireWordNet sense 2 ((used of persons and their behavior) cultivated and genteel):
refinedWordNet sense 3 (having a cheerful, lively, and self-confident air):
chipper, jauntyWordNet sense 4 (being full of or promoting cheer; having or showing good spirits):
cheerfulFrom the ODE community, based on WordNetadd/edit